﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CsharpeApplication
{
    class Class1
    {   
        static void main(string[] args)
        {
            //从现在开始每一道题我都要开始写注释
            const double pai = 3.14;     //pai的取值
            int radius = 3;   //半径的值
            int high = 4;//圆柱的高
            Console.WriteLine("圆的长度：" + 2 * pai * radius);
            Console.WriteLine("圆的长度：" + 2 * pai * radius);
            Console.WriteLine("圆柱的体积：" + pai * radius * radius * high);

            int cirle = 100;//循环输出
            switch (cirle / 10)
            {
                case 10:
                    Console.WriteLine("满分？就这就这就这");
                    break;
                case 9:
                    Console.WriteLine("优秀？九折水平");
                    break;
                case 8:
                    Console.WriteLine("良好？就这 呲~");
                    break;
                case 7:
                    Console.WriteLine("一般？hei tui~~~");
                    break;

            }

            //布尔判断值
            //
            bool judge = 2 > 1;//单一值得判断
            if(judge)
            {
                Console.WriteLine("true");//就这2>1判断题！草，被冒犯到
            }
            //双精度判断值
            bool res = 9>1;
            if(res)
            {
                Console.WriteLine("大于");
            }
            else
            {
                Console.WriteLine("小于");
            }


            
            
           
           
        }
    }
}
